"""Regression tests for /retry replacement semantics."""

from unittest.mock import AsyncMock, MagicMock

import pytest

from gateway.config import GatewayConfig
from gateway.platforms.base import MessageEvent, MessageType
from gateway.run import GatewayRunner
from gateway.session import SessionStore


@pytest.mark.asyncio
async def test_gateway_retry_replaces_last_user_turn_in_transcript(tmp_path, monkeypatch):
    # Pin DEFAULT_DB_PATH so SessionDB() doesn't write to the real ~/.hermes/state.db.
    # (Module-level constant snapshot, see test_load_transcript_db_only.)
    import hermes_state
    monkeypatch.setattr(hermes_state, "DEFAULT_DB_PATH", tmp_path / "state.db")

    config = GatewayConfig()
    store = SessionStore(sessions_dir=tmp_path, config=config)

    session_id = "retry_session"
    store._db.create_session(session_id=session_id, source="test")
    for msg in [
        {"role": "session_meta", "tools": []},
        {"role": "user", "content": "first question"},
        {"role": "assistant", "content": "first answer"},
        {"role": "user", "content": "retry me"},
        {"role": "assistant", "content": "old answer"},
    ]:
        store.append_to_transcript(session_id, msg)

    gw = GatewayRunner.__new__(GatewayRunner)
    gw.config = config
    gw.session_store = store

    session_entry = MagicMock(session_id=session_id)
    session_entry.last_prompt_tokens = 111
    gw.session_store.get_or_create_session = MagicMock(return_value=session_entry)

    async def fake_handle_message(event):
        assert event.text == "retry me"
        transcript_before = store.load_transcript(session_id)
        assert [m.get("content") for m in transcript_before if m.get("role") == "user"] == [
            "first question"
        ]
        store.append_to_transcript(session_id, {"role": "user", "content": event.text})
        store.append_to_transcript(session_id, {"role": "assistant", "content": "new answer"})
        return "new answer"

    gw._handle_message = AsyncMock(side_effect=fake_handle_message)

    result = await gw._handle_retry_command(
        MessageEvent(text="/retry", message_type=MessageType.TEXT, source=MagicMock())
    )

    assert result == "new answer"
    transcript_after = store.load_transcript(session_id)
    assert [m.get("content") for m in transcript_after if m.get("role") == "user"] == [
        "first question",
        "retry me",
    ]
    assert [m.get("content") for m in transcript_after if m.get("role") == "assistant"] == [
        "first answer",
        "new answer",
    ]


